$\left(x^2+16\right)\left(x+4\right)\cdot5$
$18-x<21x-26$
$y'=e^{-y}\left(2x+4\right)$
$n=\left(2x-1\right)^2+\left(2y-1\right)^2$
$15-+-18$
$n\left(2n\right)=528$
$\left(-20a-15\right)$
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